Tofu Miso Soup broth

Ingredients: 1 tbsp sunflower oil 3 shallots, sliced 1 litre / 1 pint 14 fl. Oz/4 cups dash or vegetable stock 6 oysters mushrooms, or pak Choi torn in thin strips 200 g/7 oz / 1 1/3 cups tofu, cubed 75 ml / 2 ½ fl. Oz /1/3 cup barley miso paste 1 tbsp sesame